JPH074483B2 - Solvent recovery device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solvent recovery device for waste solvent in the fields of painting, printing, cleaning and the like.

[0002]

2. Description of the Related Art The applicant stores an 18-liter can or the like in an evaporator so that the waste solvent loaded in the container is heated by the evaporator and cooled by a condenser outside the container to remove the solvent. We have developed and sold a solvent recovery device for recovery.

[0003]

This conventional solvent recovery device has an advantage that an 18-liter can or the like loaded with a waste solvent can be stored in the evaporator as it is and the solvent can be recovered. However, when it is desired to collect a large amount of waste solvent, an 18 liter can containing the waste solvent must be sequentially replaced in the evaporator to be stored and the solvent must be recovered.

Therefore, it is not possible to continuously collect a large amount of waste solvent, and to take out the 18 liter can or the like from which the solvent has been collected, wait until the evaporator has cooled down before removing the next 18 liters. Since the cans and the like had to be housed, there was a point where the solvent recovery processing capacity, energy saving, and labor saving were improved.

[0005]

The present invention has been made in view of the above points, and in order to solve the above problems, a distillation container is provided in an evaporator for solvent recovery. In a solvent recovery apparatus in which the distillation container loaded with the waste solvent is heated by an evaporator to recover the solvent by distillation, a waste solvent loading container in which the waste solvent is loaded in an airtight state is provided above the evaporator. The waste solvent loading container is placed in communication with the distillation container in the evaporation container via a connection pipe, and the lower end of the connection pipe is separated from the bottom of the distillation container by a predetermined amount to dispose of the waste solvent loading container. It is another object of the present invention to provide a solvent recovery device characterized in that a solvent is provided in a distillation container so that the solvent can be injected.

[0006]

According to the present invention, the waste solvent loading container in which the waste solvent is loaded in an airtight state is arranged above the evaporator, and the waste solvent loading container and the distillation container in the evaporation container are connected through the connecting pipe. Even if the distillation container is housed in the evaporator, the waste solvent can be injected from the external waste solvent loading container to recover the solvent.

Further, the lower end of the connecting pipe is separated from the bottom of the distillation container by a predetermined amount, and the waste solvent in the waste solvent loading container is arranged so that the waste solvent can be injected into the distillation container. In addition, the waste solvent can be automatically injected from the connection pipe to the predetermined height automatically from the waste solvent apparatus container, and the solvent can be recovered by the evaporator. Therefore, the waste solvent can be continuously injected into the distillation container inside the evaporator from the waste solvent loading container outside the evaporator, and the solvent can be efficiently recovered, and energy saving and labor saving in solvent recovery can be achieved.

[0008]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is an embodiment of the present invention. Solvent recovery device 1
As shown in FIG. 1, the evaporator 2 has an appropriate heat insulating structure at its peripheral portion, and is formed in a box shape in which a lid 3 is hinged on the upper surface so as to be openable and closable.

The peripheral wall of the evaporator body 4 has a double-cylinder heat pipe structure, and a heating device 5 such as electromagnetic induction heating is disposed on the bottom surface of the heat pipe structure to accommodate an 18-liter can in the evaporator body 4. The distillation container 6 such as a drum or a heat resistant container can be heated.

A connecting pipe 7 made of stainless steel or the like having a diameter of 6 to 100 mm is airtightly inserted into the lid 3 of the evaporator 2 as shown in FIG. Protruding from the bottom surface to a predetermined height such as 300 to 500 mm. This height can also be adjusted by mounting the connecting pipe 7 so that it can be raised and lowered.

The upper side of the connecting pipe 7 is hermetically connected to a waste solvent loading container 8 arranged above the evaporator 2 as shown in FIG. The waste solvent container 8 has a capacity of 3 to 10 times as large as that of the distillation container 6 and is hermetically connected to the connection pipe 7 via the cap 9 or the like, and the loaded waste solvent is pressure-balanced in a vacuum state. The distillation vessel 6 of the evaporator 2 can be automatically charged to a predetermined height via the connecting pipe 7.

An open / close valve 10 is provided in the middle of the connection pipe 7 as shown in FIG. 1 so that a waste solvent can be injected at the beginning of solvent recovery, and a waste solvent loading container 8 is connected and exchanged. Making it easier.

The evaporator 2 constructed as described above is connected to a condenser 12 via an evaporating solvent outflow pipe 11 as shown in the figure so that the evaporating solvent can be condensed and collected in a collecting container 13. .

When a predetermined amount of waste solvent is loaded in the waste solvent loading container 8 and the opening / closing valve 10 is opened with the pouring portion of the waste solvent loading container 8 facing downward as shown in FIG. 1, the waste solvent is connected to the connecting pipe. It is injected into the distillation container 6 of the evaporator 2 through 7.
Then, when the waste solvent is injected into the distillation container 6 up to the lower end of the connection pipe 7, the waste solvent loading container 8 is in an airtight state, so that the injection of the waste solvent is stopped due to the pressure balance due to the vacuum state.

In this way, the heating device 5 of the evaporator 2 is operated to start the solvent recovery, and when the solvent evaporates and is collected in the recovery container 13 through the condenser 12, the lower end of the connection pipe 7 is always maintained. The waste solvent is automatically replenished from the waste solvent filling container 8.

As described above, even if the distillation container is provided in the evaporator of the solvent recovery apparatus to recover the solvent, the solvent recovery can be interrupted without replacing the container in the evaporator. Instead, a predetermined amount of waste solvent to be loaded in the waste solvent loading container can be continuously recovered.

Therefore, energy saving of solvent recovery can be achieved, and it is not necessary to open the lid of the evaporator to replace the container, which saves manpower and enables efficient solvent recovery.

[0018]

[Other Embodiments] FIG. 2 shows another embodiment of the present invention. In this embodiment, the three-way valve 14 is arranged in the connection pipe 7 and the plurality of waste solvent loading containers 8, 8, 8 are connected to each other, and the waste solvent can be continuously recovered as described above. .

In this embodiment, the waste solvent loading containers, which are to be subjected to solvent recovery, are connected in parallel as shown in FIG.
It is preferable because the solvent can be continuously recovered.

In the embodiment, the distillation container provided in the evaporator is described as a container having a shape along the inner surface of the evaporator, but a flexible bag-like container or a paper cup-like container. Others, such as those that can be removably attached to the inner surface of the evaporator to prevent the inner surface from being contaminated and the residue can be easily taken out, can be appropriately implemented within the scope of the present invention. is there.

[0021]

As described above, according to the present invention, a large amount of waste solvent can be continuously solvent-recovered even in a solvent recovery apparatus in which a container is provided in the evaporator to recover the solvent. As a result, the processing capacity of solvent recovery can be improved, and energy saving and manpower saving can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of the present invention,

FIG. 2 is a schematic view of another embodiment of the above.

[Explanation of symbols]

1 ... Solvent recovery device 2 ... Evaporator 6
… Distillation container 7… Connection pipe 8… Waste solvent loading container

Claims (1)

[Claims] 1. A solvent recovery system in which a distillation container is disposed in a solvent recovery evaporator, and the distillation container loaded with waste solvent is heated by the evaporator to distill and recover the solvent. In the apparatus, a waste solvent loading container in which the waste solvent is loaded in an airtight state is arranged above the evaporator, and the waste solvent loading container and the distillation container in the evaporation container are connected to each other via a connection pipe, A solvent recovery device, wherein the lower end of the connection pipe is separated from the bottom of the distillation container by a predetermined amount, and the waste solvent in the waste solvent loading container is arranged so that it can be injected into the distillation container.